CN118352549B - Graphite felt electrode for enhancing reactive sites and preparation method thereof - Google Patents
Graphite felt electrode for enhancing reactive sites and preparation method thereof Download PDFInfo
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- H01M4/96—Carbon-based electrodes
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- H01M4/8605—Porous electrodes
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- H—ELECTRICITY
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Abstract
The invention discloses a graphite felt electrode for enhancing reactive sites and a preparation method thereof, comprising the following steps of surface modification treatment: immersing the graphite felt in a surface modification liquid, drying, performing heat treatment, cleaning by hydrochloric acid solution, and drying to obtain the surface modified graphite felt; activity enhancement treatment: immersing the surface-modified graphite felt in an activity enhancing liquid, carrying out water bath heat preservation, drying and then carrying out heat treatment to obtain the activity enhancing graphite felt; anoxic treatment: and (3) carrying out atomization treatment on the graphite felt with enhanced activity, and transferring the graphite felt into an atmosphere furnace for heat treatment after finishing, so as to obtain the graphite felt electrode with enhanced reactive sites. The invention can enhance the active site, the reactivity and the conductivity of the graphite felt electrode, reduce the reactive activation polarization and the ohmic polarization of the battery, and improve the voltage efficiency and the energy efficiency of the battery.
Description
Technical Field
The invention relates to the technical field of all-vanadium redox flow batteries, in particular to a graphite felt electrode for enhancing reactive sites and a preparation method thereof.
Background
The graphite felt is the preferred electrode material of the current commercial flow battery, has better porosity and lower internal resistance, fiber channels are communicated with each other, higher liquid pressure drop can not be generated to prevent the smooth circulation of electrolyte, and the three-dimensional pore structure can also accelerate the flow of the electrolyte and promote the mass transfer of active substances in the solution.
The surface properties, electrochemical activity and conductivity of graphite felt can directly affect the efficiency of the cell. The poor surface property and electrochemical activity can prevent the reaction of vanadium ions and free electrons on the surface of the electrode, directly influence the electrochemical reaction rate of the battery and increase the activation polarization of redox reaction of the battery; poor conductivity can block electron transport, increase ohmic polarization of cell redox, and further reduce energy efficiency and voltage efficiency of the cell.
Therefore, developing a graphite felt electrode that enhances reactive sites has important application value.
Disclosure of Invention
The invention aims to provide a graphite felt electrode for enhancing reactive sites and a preparation method thereof, which solve the problems of small number of the reactive sites, small specific surface area, poor activity and poor electric conductivity of the graphite felt electrode and improve the energy efficiency and the voltage efficiency of a battery.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention discloses a preparation method of a graphite felt electrode for enhancing reactive sites, which specifically comprises the following steps:
step S1: immersing a graphite felt in a surface modification liquid for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace for heat treatment after drying, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
Step S2: soaking the graphite felt with the surface modified in the step S1 in an activity enhancing liquid, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, and transferring into an atmosphere furnace for heat treatment after drying to obtain the graphite felt with the activity enhanced;
step S3: and (2) placing the graphite felt with enhanced activity in the step (S2) into an atomization device, performing atomization treatment, and transferring into an atmosphere furnace for heat treatment after the atomization treatment is finished to obtain the graphite felt electrode with enhanced reactive sites.
Preferably, the preparation method of the surface modification liquid in the step S1 comprises: uniformly dispersing a modifier and a solvent according to a mass ratio of 1 (10-100), wherein the modifier is one of potassium thiocyanate, sodium thiocyanate and ammonium thiocyanate, and the solvent is one of water and ethanol.
Preferably, the heat treatment method in step S1 is as follows: preserving heat for 1-3 h at 800-900 ℃, wherein the heating rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon.
Preferably, the preparation method of the activity enhancing liquid in the step S2 comprises the following steps: the method comprises the following steps of (1) mixing a reinforcing agent No. 1, a reinforcing agent No. 2, melamine, a dispersing agent and a solvent according to a mass ratio of 1 (1-5): (0.05-0.5): (0.01 to 0.1): (20-200), wherein the reinforcing agent No. 1 is one of nickel thiocyanate, copper thiocyanate and cobalt thiocyanate, the reinforcing agent No. 2 is one of copper chloride and nickel chloride, the dispersing agent is one of secondary alkyl sodium sulfonate, benzalkonium chloride and polysorbate, and the solvent is one of water, ammonia water and ethanol.
Preferably, the heat treatment method in step S2 is as follows: firstly, preserving heat for 1-3 hours at the temperature of 500-700 ℃, then preserving heat for 1-3 hours at the temperature of 800-900 ℃, wherein the heating rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon.
Preferably, the method of the atomization treatment in the step S3 is as follows: and (3) placing the phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 0.5-10L/min, placing a graphite felt at an air outlet of the atomizer for 0.5-2 h, and vacuum drying at the temperature of 60 ℃ for 2h after the completion.
Preferably, the heat treatment method in step S3 is as follows: preserving heat for 0.5-2 h at the temperature of 400-500 ℃ at the heating rate of 10 ℃/min, wherein the atmosphere gas is one of nitrogen and argon.
The invention relates to a graphite felt electrode for enhancing reactive sites, which is prepared by adopting the preparation method of the graphite felt electrode for enhancing reactive sites.
The invention has the beneficial effects that:
1. Through surface modification treatment, defects and sulfur elements on the surface of the graphite felt are increased, the specific surface area and electron-rich groups of the graphite felt are improved, the reactive sites of the graphite felt are improved, the oxidation-reduction reaction speed is accelerated, the activation polarization of the battery reaction is reduced, and the voltage efficiency and the energy efficiency of the battery are improved;
2. Through activity enhancement treatment, the specific surface area, sulfur element and metal atom load of the graphite felt are increased, so that the reactive sites of the graphite felt can be further improved, the conductivity and catalytic activity of the graphite felt can be improved, the activation polarization and ohmic polarization of battery reaction are reduced, and the voltage efficiency and energy efficiency of the battery are improved;
3. the invention can effectively strengthen the reactive sites of the graphite felt, improve the performance of the battery, and is suitable for the treatment application of different kinds of graphite felt.
The features and advantages of the present invention will be described in detail by way of example with reference to the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing a graphite felt electrode for enhancing reactive sites according to the invention;
FIG. 2 is a scanning electron microscope image of a graphite felt electrode with enhanced reactive sites according to example 1 of the present invention;
FIG. 3 is a graph of nitrogen adsorption on a graphite felt electrode with enhanced reactive sites in accordance with example 1 of the present invention;
FIG. 4 cyclic voltammogram of a graphite felt electrode for enhanced reactive sites of example 1 of the present invention.
Detailed Description
The present invention will be further described in detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
Referring to fig. 1, the preparation method of the graphite felt electrode for enhancing reactive sites of the invention specifically comprises the following steps:
Step S1: surface modification treatment: immersing a graphite felt in a surface modification liquid for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace for heat treatment after drying, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
Step S2: activity enhancement treatment: soaking the graphite felt with the surface modified in the step S1 in an activity enhancing liquid, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, and transferring into an atmosphere furnace for heat treatment after drying to obtain the graphite felt with the activity enhanced;
Step S3: anoxic treatment: and (2) placing the graphite felt with enhanced activity in the step (S2) into an atomization device, performing atomization treatment, and transferring into an atmosphere furnace for heat treatment after the atomization treatment is finished to obtain the graphite felt electrode with enhanced reactive sites.
In one possible embodiment, the preparation method of the surface modification solution in the step S1 is as follows: uniformly dispersing a modifier and a solvent according to a mass ratio of 1 (10-100), wherein the modifier is one of potassium thiocyanate, sodium thiocyanate and ammonium thiocyanate, and the solvent is one of water and ethanol.
In a possible embodiment, the heat treatment method in step S1 is: preserving heat for 1-3 h at 800-900 ℃, wherein the heating rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon.
In a possible embodiment, the preparation method of the activity enhancing liquid in the step S2 is as follows: the method comprises the following steps of (1) mixing a reinforcing agent No. 1, a reinforcing agent No. 2, melamine, a dispersing agent and a solvent according to a mass ratio of 1 (1-5): (0.05-0.5): (0.01 to 0.1): (20-200), wherein the reinforcing agent No. 1 is one of nickel thiocyanate, copper thiocyanate and cobalt thiocyanate, the reinforcing agent No. 2 is one of copper chloride and nickel chloride, the dispersing agent is one of secondary alkyl sodium sulfonate, benzalkonium chloride and polysorbate, and the solvent is one of water, ammonia water and ethanol.
In a possible embodiment, the heat treatment method in step S2 is as follows: firstly, preserving heat for 1-3 hours at the temperature of 500-700 ℃, then preserving heat for 1-3 hours at the temperature of 800-900 ℃, wherein the heating rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon.
In a possible embodiment, the atomization processing method in the step S3 is: and (3) placing the phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 0.5-10L/min, placing a graphite felt at an air outlet of the atomizer for 0.5-2 h, and vacuum drying at the temperature of 60 ℃ for 2h after the completion.
In a possible embodiment, the heat treatment method in step S3 is as follows: preserving heat for 0.5-2 h at the temperature of 400-500 ℃ at the heating rate of 10 ℃/min, wherein the atmosphere gas is one of nitrogen and argon.
In one possible embodiment, a graphite felt electrode for enhancing reactive sites of the present invention is prepared by the method for preparing a graphite felt electrode for enhancing reactive sites as described above.
Example 1
The embodiment is specifically obtained by the following operations:
Step S1: immersing a graphite felt in a surface modification liquid prepared by uniformly dispersing 1 part by mass of potassium thiocyanate and 50 parts by mass of water for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace, preserving heat at 800 ℃ for 2h, heating at 10 ℃/min, performing heat treatment under the condition that atmosphere gas is nitrogen, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
Step S2: immersing the surface-modified graphite felt prepared in the step S1 in an activity reinforcing liquid prepared by 1 part by mass of nickel thiocyanate, 1 part by mass of nickel chloride, 0.1 part by mass of melamine, 0.04 part by mass of sodium secondary alkyl sulfonate and 50 parts by mass of water uniformly, carrying out water bath heat preservation at 50 ℃ for 30min, then taking out, drying at 60 ℃ for 5h, transferring into an atmosphere furnace after drying, carrying out heat preservation at a heating rate of 10 ℃/min under the condition that the atmosphere gas is argon, carrying out heat preservation at 600 ℃ for 2h, and carrying out heat treatment at 800 ℃ for 1h to obtain the activity-reinforced graphite felt;
Step S3: and (2) placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 3L/min, placing the graphite felt with the enhanced activity in the step (S2) at an air outlet of the atomizer for 1h, drying the graphite felt for 2h at the temperature of 60 ℃ after the completion of the operation, transferring the graphite felt into an atmosphere furnace, and carrying out heat treatment at the temperature of 400 ℃ for 1h under the condition that the temperature rising rate is 10 ℃/min and the atmosphere gas is nitrogen, thereby obtaining the graphite felt electrode with the enhanced reactive site.
Example 2
The embodiment is specifically obtained by the following operations:
Step S1: immersing a graphite felt in a surface modification liquid prepared by uniformly dispersing 1 part by mass of sodium thiocyanate and 50 parts by mass of ethanol for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace after drying, preserving heat at 900 ℃ for 1h, carrying out heat treatment at a heating rate of 10 ℃/min under the condition that the atmosphere gas is argon, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with a concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
Step S2: immersing the surface-modified graphite felt prepared in the step S1 in an activity reinforcing liquid prepared by uniformly dispersing 1 part by mass of copper thiocyanate, 3 parts by mass of copper chloride, 0.03 part by mass of melamine, 0.05 part by mass of benzalkonium chloride and 20 parts by mass of ammonia water, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, transferring into an atmosphere furnace after drying, carrying out heat preservation at a heating rate of 10 ℃/min under the condition that the atmosphere gas is nitrogen, carrying out heat preservation at 500 ℃ for 3h, and carrying out heat treatment at 900 ℃ for 2h to obtain the activity-reinforced graphite felt;
Step S3: and (2) placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 0.5L/min, placing the graphite felt with the enhanced activity in the step (S2) at an air outlet of the atomizer for 1h, drying the graphite felt for 2h at the temperature of 60 ℃ after the completion of the operation, transferring the graphite felt into an atmosphere furnace, heating the graphite felt with the temperature of 10 ℃/min, and carrying out heat treatment at the temperature of 500 ℃ for 0.5h under the condition that the atmosphere gas is argon, thereby obtaining the graphite felt electrode with the enhanced reactive sites.
Example 3
The embodiment is specifically obtained by the following operations:
Step S1: immersing a graphite felt in a surface modification liquid prepared by uniformly dispersing 1 part by mass of potassium thiocyanate and 70 parts by mass of water for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace, preserving heat at 850 ℃ for 3h, heating at a rate of 10 ℃/min, performing heat treatment under the condition that atmosphere gas is nitrogen, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with a concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
step S2: immersing the surface-modified graphite felt prepared in the step S1 in an activity reinforcing liquid prepared from 1 part by mass of nickel thiocyanate, 5 parts by mass of copper chloride, 0.5 part by mass of melamine, 0.1 part by mass of polysorbate and 100 parts by mass of water uniformly, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, transferring into an atmosphere furnace after drying, carrying out heat preservation at a heating rate of 10 ℃/min under the condition that the atmosphere gas is argon, carrying out heat preservation at 700 ℃ for 1h, and carrying out heat treatment at 850 ℃ for 3h to obtain the activity-reinforced graphite felt;
step S3: and (2) placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 10L/min, placing the graphite felt with the enhanced activity in the step (S2) at an air outlet of the atomizer for 0.5h, drying in vacuum at the temperature of 60 ℃ for 2h after the completion of the operation, transferring into an atmosphere furnace, heating at the temperature rising rate of 10 ℃/min, preserving heat for 2h under the condition that the atmosphere gas is nitrogen and the temperature is 450 ℃, and performing heat treatment to obtain the graphite felt electrode with the enhanced reactive site.
Example 4
The embodiment is specifically obtained by the following operations:
Step S1: immersing a graphite felt in a surface modification liquid prepared by uniformly dispersing 1 part by mass of ammonium thiocyanate and 100 parts by mass of water for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace, preserving heat at 800 ℃ for 3h, heating at 10 ℃/min, performing heat treatment under the condition that the atmosphere gas is argon, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
Step S2: immersing the surface-modified graphite felt prepared in the step S1 in an activity reinforcing liquid prepared by uniformly dispersing 1 part by mass of cobalt thiocyanate, 2 parts by mass of nickel chloride, 0.5 part by mass of melamine, 0.01 part by mass of benzalkonium chloride and 200 parts by mass of ammonia water, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, transferring into an atmosphere furnace after drying, carrying out heat preservation at a heating rate of 10 ℃/min under the condition that the atmosphere gas is nitrogen, carrying out heat preservation at 500 ℃ for 3h at the temperature, and carrying out heat treatment at 800 ℃ for 3h to obtain the activity-reinforced graphite felt;
Step S3: and (2) placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 5L/min, placing the graphite felt with the enhanced activity in the step (S2) at an air outlet of the atomizer for 1h, drying in vacuum at the temperature of 60 ℃ for 2h after the completion of the operation, transferring into an atmosphere furnace, heating at the heating rate of 10 ℃/min, and carrying out heat treatment at the temperature of 500 ℃ for 0.5h under the condition that the atmosphere gas is nitrogen, thereby obtaining the graphite felt electrode with the enhanced reactive active site.
Example 5
The embodiment is specifically obtained by the following operations:
Step S1: immersing a graphite felt in a surface modification liquid prepared by uniformly dispersing 1 part by mass of sodium thiocyanate and 10 parts by mass of ethanol for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace after drying, preserving heat for 2h at 800 ℃ with the temperature rising rate of 10 ℃/min and under the condition that the atmosphere gas is argon, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt;
step S2: immersing the surface-modified graphite felt prepared in the step S1 in an activity reinforcing liquid prepared by uniformly dispersing 1 part by mass of copper thiocyanate, 2 parts by mass of copper chloride, 0.2 part by mass of melamine, 0.06 part by mass of benzalkonium chloride and 150 parts by mass of ethanol, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, transferring into an atmosphere furnace after drying, carrying out heat preservation at 700 ℃ for 3h under the condition of heating rate of 10 ℃/min and under the condition of nitrogen as atmosphere gas, and carrying out heat treatment at 900 ℃ for 2h to obtain the activity-reinforced graphite felt;
Step S3: and (2) placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to 7L/min, placing the graphite felt with the enhanced activity in the step (S2) at an air outlet of the atomizer for 1.5h, drying the graphite felt for 2h at the temperature of 60 ℃ after the completion of the operation, transferring the graphite felt into an atmosphere furnace, and carrying out heat treatment at the temperature of 400 ℃ for 1.5h under the condition that the temperature rising rate is 10 ℃/min and the atmosphere gas is nitrogen, thereby obtaining the graphite felt electrode with the enhanced reactive sites.
Comparative example 1:
in this comparative example, a pretreated graphite felt obtained after only the step S1 in example 1 was used as an electrode.
Comparative example 2:
the comparative example uses untreated graphite felt as the electrode.
Characterization of the graphite felt obtained in example 1 and comparative example 1, referring to fig. 2, it can be seen that a graphite felt electrode fiber with enhanced reactive sites prepared in example 1 of the present invention has a rough surface and a lot of particles distributed, indicating that the method of the present invention increases defects on the surface of the graphite felt fiber, thereby increasing specific surface area and reactive sites, and simultaneously has a lot of metal/metal oxide supported thereon, further enhancing reactivity. Figure 3 further characterizes the specific surface area of a reactive site enhanced graphite felt electrode prepared in example 1 of the present invention, which is significantly higher than that of a blank graphite felt. Fig. 4 shows that two distinct current peaks appear in both graphite felts, wherein the graphite felt electrode with enhanced reactive sites prepared by the method has the largest response current density, and the current density ratio of the oxidation peak to the reduction peak is closer to 1, which indicates that the graphite felt electrode with enhanced reactive sites prepared by the method has better symmetry of oxidation and reduction current densities and improved kinetic reversibility. In addition, the initial potential and the oxidation-reduction peak potential difference of the oxidation process of the graphite felt electrode for enhancing the reactive sites prepared by the invention are smaller, which indicates that the electrochemical activity is higher.
The graphite felts prepared in the examples and the comparative examples are used as electrodes to be assembled into a pile, and charge and discharge cycle tests are carried out under the same working condition, and the results are shown in table 1:
TABLE 1 electric pile results summary table
It can be seen that compared with comparative examples 1-2, examples 1-5 increase defects and sulfur elements on the surface of the graphite felt through surface modification treatment, increase the specific surface area and electron-rich groups of the graphite felt, increase the reactive sites of the graphite felt, accelerate the redox reaction, reduce the activation polarization of the battery reaction, and increase the voltage efficiency and energy efficiency of the battery; compared with comparative example 1, examples 1-5 increase the specific surface area, elemental sulfur and metal atom loading of the graphite felt by further activity enhancing treatment, which not only can further increase the reactive sites of the graphite felt, but also can increase the conductivity and catalytic activity of the graphite felt, reduce the activation polarization and ohmic polarization of the battery reaction, and further increase the voltage efficiency and energy efficiency of the battery.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (2)
1. The preparation method of the graphite felt electrode for enhancing the reactive sites is characterized by comprising the following steps of:
Step S1, surface modification treatment: immersing a graphite felt in a surface modification liquid for 10min, taking out, drying at 60 ℃ for 5h, placing the graphite felt in an atmosphere furnace for heat treatment after drying, cleaning the heat-treated graphite felt by using a hydrochloric acid solution with the concentration of 1mol/L, and drying at 60 ℃ for 5h to obtain the surface-modified graphite felt; the preparation method of the surface modification liquid comprises the following steps: uniformly dispersing a modifier and a solvent according to the mass part ratio of 1 (10-100), wherein the modifier is one of potassium thiocyanate, sodium thiocyanate and ammonium thiocyanate, and the solvent is one of water and ethanol; the heat treatment method comprises the following steps: preserving heat for 1-3 h at 800-900 ℃, wherein the heating rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon;
Step S2, activity enhancement treatment: soaking the graphite felt with the surface modified in the step S1 in an activity enhancing liquid, carrying out water bath heat preservation at 50 ℃ for 30min, taking out, drying at 60 ℃ for 5h, and transferring into an atmosphere furnace for heat treatment after drying to obtain the graphite felt with the enhanced activity; the preparation method of the activity enhancing liquid comprises the following steps: the reinforcing agent No. 1, the reinforcing agent No. 2, melamine, a dispersing agent and a solvent are mixed according to the mass part ratio of 1 (1-5): (0.05-0.5): (0.01-0.1): (20-200) uniformly dispersing to obtain the reinforcing agent 1, wherein the reinforcing agent 1 is one of nickel thiocyanate, copper thiocyanate and cobalt thiocyanate, the reinforcing agent 2 is one of copper chloride and nickel chloride, the dispersing agent is one of secondary alkyl sodium sulfonate, benzalkonium chloride and polysorbate, and the solvent is one of water, ammonia water and ethanol; the heat treatment method comprises the following steps: firstly preserving heat for 1-3 h at 500-700 ℃, then preserving heat for 1-3 h at 800-900 ℃, wherein the temperature rising rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon;
Step S3, anoxic treatment: placing the graphite felt with enhanced activity in the step S2 into an atomization device, performing atomization treatment, and transferring into an atmosphere furnace for heat treatment after the atomization treatment is finished to obtain a graphite felt electrode with enhanced reactive sites; the atomization treatment method comprises the following steps: placing phenylalanine water solution with the concentration of 1mol/L into an atomizer, regulating the flow to be 0.5-10L/min, placing graphite felt at an air outlet of the atomizer for 0.5-2 h, and vacuum drying at 60 ℃ for 2h after the completion; the heat treatment method comprises the following steps: preserving heat for 0.5-2 h at 400-500 ℃, wherein the temperature rising rate is 10 ℃/min, and the atmosphere gas is one of nitrogen and argon.
2. A graphite felt electrode for enhancing reactive sites, characterized by: the graphite felt electrode is prepared by adopting the preparation method of the graphite felt electrode for enhancing the reactive sites, which is disclosed in claim 1.
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